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the lower fixture whose vertical position is adjusted by a mechanical power screw mechanism, enabling a controlled normal load ranging from 45 N to 4450 N applied on the pin-on-disk interface. Also, this lower fixture is mounted on a 6-axis force transducer so that the forces in the x, y, and z linear directions can be measured in-situ to obtain the coefficient of friction (COF). Both the upper spindle and lower fixture holding the samples are located inside an environmentally controlled vacuum chamber of the HPT capable of pressure control from near near-zero up to 1.72 MPa (250 psi). 3.2.1 Samples ® G2), a commonly used material in compressors with a bulk hardness of 2.2 GPa, was machined to 79 mm diameter and 8 mm thickness disks as shown in Figure 3.1. The disks had an initial (as machined) root-mean-square surface roughness (Rq) of 0.4 μm. After grit-blasting with aluminum oxide (which was performed before depositing the polymeric coatings to increase adhesion), Rq increased to 3.5 μm, which facilitated the deposition of polymeric coatings on the substrate surface. Seven different polymeric coatings, namely, PTFE/Pyrrolidone-1 (DuPontTM Teflon® 958-303), PTFE/Pyrrolidone-2 (DuPontTM Teflon® 958-414), Resin/PTFE/MoS2 ®® (Whitford Xylan 1052), PEEK/PTFE (1704 PEEK/PTFE ), PEEK/Ceramic (1707 ®®® PEEK/Ceramic ), Fluorocarbon (Impreglon 218), and PTFE/MoS2 (Fluorolon 325) were deposited on the grit-blasted substrates using a spray gun. The name of each coating already shows their base materials, but the entire compositions (including solvents) of these commercially available coatings are unknown due to the proprietary of the coating suppliers. In the case of DuPontTM coatings, they were dried for 5 min after Gray cast iron (Dura-Bar 25PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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